103.1 Work on the command line

Use single shell commands and one line command sequences to perform basic tasks on the command line.

Use and modify the shell environment including defining, referencing and exporting environment variables.

Use and edit command history.

Invoke commands inside and outside the defined path.

bash

echo

env

export

pwd

set

unset

type

which

man

uname

history

.bash_history

Quoting